CV
Education
- PhD in Economic History, LSE, in progress
- MPhil in Sociology and Demography, University of Oxford, 2023
- BA in Human Sciences, University of Oxford, 2021
Academic positions
- Oslo Metropolitan University
- Research Fellow (Forsker III), Centre for Pandemics & Society (PANSOC), January–December 2024
Academic affiliations
- Leverhulme Centre for Demographic Science, University of Oxford, July 2025–
- Centre for Advanced Study at the Norwegian Academy of Science and Letters, Short-term Residential Fellow, November–December 2025
Teaching positions
- University of Oxford
- Instructor for “Demography and Population” (BA Human Sciences & BA Philosophy, Politics, and Economics), 2022–
- Instructor for “Introduction to Demography” (BA Human Sciences), 2023
Publications
- Gaddy, H., Sear, R., & Fortunato, L. (2025). High rates of polygyny do not lock large proportions of men out of the marriage market. PNAS, 122(40): e2508091122. doi:10.1073/pnas.2508091122
- Blinkova, A.O., Khakurel, U., Gaddy, H., Mamelund, S.-E., & Bekker-Nielsen Dunbar, M. (2025). Construction and curation of a data set of historical mental health incidence in Norway. Scientific Data 12: 1510. doi:10.1038/s41597-025-05795-y
- Gaddy, H., & Gargiulo, M. (2025). Can we estimate crisis death tolls by subtracting total population estimates? A critical review and appraisal. Demographic Research, 52: 741–796. doi:10.4054/DemRes.2025.52.23
- Gaddy, H., & Mølbak Ingholt, M. (2024). Did the 1918 pandemic cause a 1920 baby boom? Demographic evidence from neutral Europe. Population Studies, 78: 269–287. doi:10.1080/00324728.2023.2192041
- Gaddy, H. (2021). Social distancing and influenza mortality in 1918 did not increase suicide rates in the United States. SSM – Population Health, 6: 100944. doi:10.1016/j.ssmph.2021.100944
- Gaddy, H. (2021). A decade of TFR declines suggests no relationship between development and sub-replacement fertility rebounds. Demographic Research 44: 125–142. doi:10.4054/DemRes.2021.44.5
- Gaddy, H. (2020). Brexit and the geography of depression. Social Science & Medicine 264: 113276. doi:10.1016/j.socscimed.2020.113276
- Gaddy, H. (2020). Using local knowledge in emerging infectious disease research. Social Science & Medicine 258: 113107. doi:10.1016/j.socscimed.2020.113107
Awards and grants
- LSE PhD Studentship, London School of Economics, 2023–28
- Roger Schofield Award for Best Paper by a Young Demographer, European Society of Historical Demography, 2022
- Grand Union Doctoral Training Partnership Scholarship, Economic and Social Research Council (ESRC) and Nuffield College, Oxford, 2021–23
- Wilma Crowther Prize for Best Undergraduate Dissertation, Institute of Human Sciences, Oxford, 2021
- Demyship (highest undergraduate prize), Magdalen College, Oxford, 2020
Other employment
- Calleva Research Centre for Evolution and Human Science, University of Oxford
- Administrative assistant, 2023–
- Magdalen College, University of Oxford
- BA Human Sciences admissions interviewer, 2023
- Centre for Experimental Social Sciences, University of Oxford
- Laboratory assistant, 2022–23
Service
- Current positions
- LSE Historical Economic Demography Group, Advisory Board Member, 2025–
- Association of Young Historical Demographers, Board member, 2024–
- GreatLeap, COST Management Committee member, 2023–
- Conference organisation
- European Society of Historical Demography (ESHD), Session chair (2025)
- European Social Science History Conference (ESSHC), Session organiser and discussant (2025)
- PopFest, Historical Demography strand co-organiser (2025)
- British Society of Population Studies (BSPS), Session chair (2024; 2022 x 2)
- Peer review
- Demography (2), International Journal of Epidemiology (1), Population Studies (1), Schizophrenia (1), Violence Against Women (1), Humanities & Social Sciences Communications (1), Population Research and Policy Review (1), Journal of Comparative Family Studies (1), Human Ecology (1), Discover Public Health (1), EcoHealth (1), Ethnobiology and Conservation (1), Czech Science Foundation (1)
